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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Allowance for doubtful receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Allowance for doubtful receivables |  |
Receivable from Sinosure recorded in prepaid expenses and other current assets | $ 164 | $ 9

X
- Definition Represents the amount of receivable from China Export & Credit Insurance Corporation recorded in prepaid expenses and other current assets. + References No definition available. + Details
Name: | csiq_InsuranceForBadDebtLossReceivableCurrent
Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableGrossAllowanceAndNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration